Indochinite tektites are black melted pieces of stone and sand that form at a meteorite impact.

Impact Glass is a mix of Earthly and extraterrestrial material

The tremendous heat of a meteorite impact melts a mix of terrestrial and earthy sand and rock into glass. The force of impact ensures that the molten glass is thrown over a vast distance. After a meteorite impact it rains glass drops in the far and wide area. At these black tektites the teardrop shape of the devastating "glass rain" is easy to distinguish

High melting temperature

Tektites are distinguished from other natural glass by a very low content of water . Compared with Obsidian, the most common natural glass on earth, even up to 1000 times less. A Tektite also melts at a much higher temperatures and is more viscous.